Vehicle brake



G., c. R. KUl PER 2,139,083

VEH ICLE BRAKE Dec. 6, 1938.

Filed Aug. 21, 1935 INVENTOR 656M420 61,6 Au/pze ATTORNEY Patented Dec.6, 1938 UNITED STATES PATENT OFFICE to The Midland Steel ProductsCompany,

Cleveland, Ohio, a corporation of Ohio Application August 2 1, 1935,Serial No. 37,191

7 Claims.

This invention relates to vehicle brakes and an important object of theinvention is to eliminate the objectionable audible clicking noiseincidental to the end of a brake shoe striking an anchor pin uponreturning to brake release position.

. Another object of the invention is to soften the impact between abrake shoe end and an anchor pin when the shoe returns to idle positionand to eliminate any audible rattling tendencies between a brake shoeend and an anchor pin when the brake reposes in idle position.

A further object of the invention is to retard the movement of a brakeshoe end toward an anchor pin,

Other objects and advantages of the invention will become apparentduring the course of the following description.

In the drawing accompanying this specification and forming a part ofthis application, I have shown, for purposes of illustration, certainembodiments which my invention may assume, and in this drawing likenumerals are employed to designate like parts throughout the severalviews,

Fig. 1 is a partial elevational view of a brake shoe assembly includingone embodiment of my anchor pin silencing means, herein shown disposedbetween an anchor pin and the adjacent ends of a brake shoe,

Fig. 2 is a fragmentary sectional view corresponding substantially tothe line 2-2 of Fig. 1,

Fig. 3 is a fragmentary sectional view similar to Fig. 2, showinganother embodiment of my anchor pin silencing means,

Fig. 4 is a perspective view of one type of retaining means for holdingthe anchor pin silencing means,

Fig. 5 is a perspective view of another type of retaining means forholding the anchor pin silencing means.

Referring to the drawing, the numeral l0 designates a brake drum theopen face of which is closed by a backing plate suitably mounted on avehicle axle, not shown. A plate l2 for reinforcing the backing plateadjacent an anchor pin I4 is mounted on the backing plate The backingplate and-reinforcing plate |2 are provided with aligned openings forthe reception of a reduced portion l3 of the anchor pin M which has anannular shoulder l5 abutting against the backing plate II. The anchorpin I4 is rigidly afiixed to the plates H and I2 by suitable meansherein shown as a washer l6 and an upset end I! of the anchor pin l4.Adjacent the anchor pin l4, the backing plate I is provided with anaperture through which one endof a brake operating flexible cableextends and is connected with a clevis I8 pivotally connected to a twoarm toggle link I9 and a toggle link 20 employed for moving either endof a brake shoe 2| with respect to the anchor pin 14 to operate thebrake.

The brake shoe herein illustrated comprises a split ring having spacedends 22 and 23, the end 22 stopping short of the anchor pin I4 and theend 23 being disposed adjacent the anchor pin l4.

The brake shoe 2| is of T-shape cross section having a peripheral web 24and radial ribs 25 and 26 which are cut away as shown at I00 to lendflexibility to the end 22 of the brake shoe 2 I, and the uncut portion21 of the radial ribs 25 and 26 render the adjacent web portions 28 andthe end 23 of the brakeshoe 2| substantially rigid. A brake lining 29 ismounted on the peripheral web 24 of the brake shoe 2|.

The flexible end 22 of the brake shoe 2| is normally held in definiterelation with respect to the anchor pin I4 by an adjuster 30 secured toan inwardly extending radial rib 35 of the brake shoe 2| by means of apair of adjuster plates 36 and 3'! held in position by suitable means,such as rivets 38. The adjuster 30 is controlled in its circumferentialmovement with respect to the brake shoe 2| by, a screw device 39 asexplained in the Sneed Patent No. 1,789,392 of January 20, 1931.

In order to connect the toggle mechanism with p the two ends of thebrake shoe 2 I, a toggle pin 4| is secured to the adjuster 30 as shownin Fig. 2, and a similar pin 42 is secured to the radial webs 25 and 26adjacent the anchor pin [4 in a similar manner. The two armed togglelink [9 is pivotally connected to the toggle pin 4| with a roller 43disposed between the arms thereof to provide rolling contact with thebacking plate I I while the toggle link 20 is pivotally connected to thetoggle pin 42 with rollers 44 arranged on opposite sides a of the togglelink 28 for rolling contact with the backing plate Whenever the brakecable is operated to apply the brake, the elbow of the toggle links tendto straighten out and move one or the other of the ends of the brakeshoe 2| away from the anchor pin I4, depending upon the direction ofrotation of the drum Hi. The brake shoe 2| is returned to and held inits normal position with respect to the anchor pin by means of interconnected retractor springs 45 which in turn are connected to the brakeshoe as illustrated in Fig. l. A second spring 46 has one end connectedto the rib 21 of the rigid side of the brake shoe in chordal relationand in its other end connected to the backing plate I adjacent theretractor spring 45 so that greater effort is required tomove the rigidend 23 of the brake shoe 2| than the flexible end 22 with the resultthat the latter is moved from the anchor pin I4 first to engage thebrake lining 29 with the drum III.

In order to silence the impact and prevent rattling between the anchorpin I4 and the free ends of the adjuster plates 36 and 31, a cushioningmember 5| of any suitable sound deadening material such as rubber or thelike, is inserted between the free ends of the adjuster plates 36 and 31and the anchor pin I4.

A recess 53 for accommodating the cushion member 5| is formed betweenthe adjuster plates 36 and 31 by terminating the adjuster plate 31 shortof the adjuster plate 36 and securing a clamping member 52 to theexposed side of the adjuster plate 31. The rubber member 5| is suitablymounted within the recess 53, as by vulcanizing, and has an exposedportion 54 extending beyond the free ends of the adjuster plates 36 and31 and the clamping member 52. The exposed portion 54 of the rubbermember 5| is provided with an arcuate seat 55 conforming to the contourof the anchor pin M, the arcuate seat 55 being in engagement with theanchor pin l4 when the brake is in-released position. Disposed alongopposite faces of the rubber member 5| are grooves 56 to allow therubber member 5| to be compressed and move inwardly oi" the recess 53whenever sufficient pressure is exerted upon the arcuate seat 55 of therubber member 5|. The adjuster plate 36 and the clamping plate 52 arealso respectively provided with arcuate seats 51 and 58 which conform tothe contour of the anchor pin I4 and are adapted to engage the lattershould the arcuate seat 55 of the cushioning member 5| yield to a pointinwardly of the arcuate faces 51 and 58.

A cushioning member 60, similar to the member 5|, is also provided forthe rigid end 23 of the brake shoe 2| and is mounted in. a recess formedby the radial ribs and 26 and a clamping member 62 similar to theclamping member 52. in operation, assuming that the motor vehicle ismoving in a forward direction, the direction of the drum rotation willthen be counter-clockwise as viewed in Fig. 1. Application of brakingpower operates the toggle mechanism which spreads the flexible end ofthe brake shoe 2| away from the anchor pin 14 against the force exertedby the springs to place the brake lining 29 into frictional engagementwith the brake drum Ill. The rotating brake drum of course tends toshift the flexible brake shoe end 22 still farther away from the anchorpin I4 and to move the more rigid brake shoe end 23 into firmerengagement with the anchor pin l4.

Upon removal of the braking force the springs 45 cause the flexiblebrake shoe end to move rapidly toward the anchor pin l4. And since thedirection of drum rotation is counter-clockwise the rigid brake shoe end23 is so close to the anchor pin I4 that when it engages the anchor pinI4 no audible sound will be produced from such engagement. Under someconditions if the flexible brake shoe end 22 returns rapidly to theanchor pin l4, without some method of reducing the shock of thisengagement, an audible clicking may be heard due to the force and speedwith which the flexible brake shoe end 22 approached the anchor pin l4.However, the arcuate seat of the cushioning member 5| will engage theanchor pin 14 to reduce and cushion the impact of the flexible brakeshoe end 22 against the anchor pin l4 and thereby preclude emission ofsounds from the brake. Should the arcuate seat 55 of the cushioningmember 5| yield inwardly of the arcuate seats 51 and 58, then theselatter seats will engage the anchor pin 4, but the force of thisengagement will have been so reduced as not to produce any audiblesound.

When the vehicle is moving in a backward direction and the brake isapplied, the rotation of the drum l0 tends to shift the rigid brake shoeend 23 from the anchor pin l4. Upon removal of the braking force therigid brake shoe end 23 is moved to released position toward the anchorpin M by means of the springs 45 and 46. The cushioning member 66engages the anchor pin M to reduce and soften the impact of the rigidbrake shoe end 23 against the anchor pin M in the same manner asdescribed in connection with the cushion member 5|.

Accordingly, it is apparent that the anchor pin I4 is not subjected toviolent impacts from the brake shoe ends and the connection of theanchor pin M with the backing plate H is not impaired.

Since the cushion members 5| and 63 are at all times disposed betweenthe brake shoe end and the anchor pin |4 they will prevent any rattlingbetween the metal ends of the brake shoe and the anchor pin |4 thatmight otherwise occur when the brake is in released position.

Referring to Fig. 3 the embodiment of the invention therein disclosedcomprises the adjuster plates 36 and 31 provided respectivelywitharcuate seats 65 and 66 conforming to the contour of the anchor pinl4. Mounted on the adjuster plate 31 is a cushioning member 61 of sounddeadening material such as rubber, or the like, which is provided with arecess to accommodate the head of a rivet 68 securing the adjusterplates 36 and 31 together. An impact or silencing member 69, forreceiving the force of the impact caused by engagement of the brake shoeend with the anchor pin I4 is vulcanized on to the rubber member 61causing the extrusion 10 of rubber through an opening 1| in the impactmember 69.

The impact member 69 and cushion member 61 are respectively providedwith arcuate seats 13 and 14 conforming to the contour of the anchor pinI4. The arcuate seat 13 extends beyond the arcuate seat 14 and normallyengages the anchor pin |4 when the brake is in or returns to releasedposition to maintain the arcuate metallic seats 65 and 66 and the rubberseat 14 spaced from the anchor pin M.

A cushioning member 15 and an impact member 16, similar respectively tothe cushion member 61 and impact member 69, are also mounted on therigid end 23 of the brake shoe 2|.

The brake shoe ends of Fig. 3 are moved from and toward the anchor pin Min the same manner as described in connection with Figs. 1 and 2. Inthis instance however, when the vehicle is moving in a forward directionand the brake.

applying force is removed, the arcuate seat 13 of the impact member 69first engages the anchor pin |4 upon retractive movement of the flexibleend of the brake shoe. Since the impact member 69 is mounted upon thecushion member 61 the latter will yield and thereby cushion and silencethe impact of the member 69 with the anchor pin M. This engagement willbe had without producing any audible sound. Should the cushion member 61yield to such an extent that the arcuate seat 13 of the impact member 69is in alignment with the arcuate seats 65, 66 and 14, then the latterarcuate seats will also engage the anchor pin I4, but when suchengagement is made the movement of the flexible brake shoe end is soretarded and the force of engagement so reduced by the yielding of thecushion member 61 that no audible sound will be produced.

Upon backward movement of the vehicle the cushion member 15 and theimpact member 16 operate to soften and reduce the impact of the rigidbrake shoe end 23 against the anchor pin [4 when the brake is released,as will be understood.

Fig. 4 illustrates another form of holding means for the cushion member5! and comprises end plates and 8|, which form part of the adjuster 30and a clamping member 82 having an offset portion secured to theadjuster plates 80 and BI by rivets 83. A recess 84 for accommodatingthe cushion member 5| is formed between the adjuster plate 8|, theclamping member 82 and the adjuster plate 80 which terminates short ofarcuate faces 85 and 86 respectively provided on the clamping member 82and adjuster plate 8|. The clamping member 82 and the adjuster plate 8!are respectively provided with flanges 81 and 88 extending in oppositedirections to span the recess 84 and confine the cushion member 5| inthe recess 84. The cushion member 5| is also, in this embodiment,provided with grooves 56 to allow the resilient member 5| to becompressed inwardly of the arcuate seats 85 and 86.

The holding means shown in Fig. 5 is similar to that shown in Fig. 2,with the exception that the cushion member 5| is secured within therecess 53 by means of a rivet 98 extending through the clamping member52, the sound deadening member 5| and the adjuster plate 36.

It is to be understood that various changes in the size, shape,arrangement of parts and operation of the same may be resorted towithout departing from the spirit of the invention or the scope of theappended claims.

I claim:

1. In a brake, an anchor pin, a brake shoe having one end thereofengageable with said anchor pin, and cushioning means constituted solelyof rubber and interposed beween said brake shoe and-said anchor pin.

2. In a brake, an anchor pin, a brake shoe having one end thereofmovable into engagement with said anchor pin, and means for engagingsaid anchor pin prior to said engagement of said brake shoe end withsaid anchor pin to retard movement of said brake shoe end toward saidanchor pin.

3. In a brake, an anchor pin, a brake shoe having one end thereofmovable toward said anchor pin, means constituted solely by a singleresilient member interposed between said anchor pin and said brake shoeend adapted to directly engage said anchor pin to cushion said movementof said brake shoe end toward said anchor pin, and spaced membersforming part of said brake shoe and defining a pocket for securing saidcushioning means in position at said brake shoe end.

4. In a brake, an anchor pin, a brake shoe having an end thereof movabletoward said anchor pin, and cushioning means constituted solely ofrubber interposed between said anchor pin and brake shoe end and havinga portion contoured complementary to said anchor pin for engagementtherewith to retard movement of said brake shoe end toward said anchorpin, and having a cutout portion to permit flexing of the rubber duringbraking to maintain said rubber lively and thus prolong the useful lifeof said rubber.

5. In a brake, an anchor pin, a brake shoe having a radially extendingweb at an end thereof, a member spaced from said web and cooperatingtherewith to define a pocket, and cushioning means constituted solely ofa flexible member having a portion disposed in said pocket and anotherportion adapted to engage said anchor pin to retard movement of saidbrake shoe end toward said anchor pin.

6. In a brake, an anchor pin, a brake shoe having a radially extendingweb at an end thereof, a member spaced from said web and cooperatingtherewith to define a pocket, and cushioning means constituted solely ofrubber having a portion disposed in said pocket and another portionadapted to engage said anchor pin to retard movement of said brake shoeend toward said anchor pin, said rubber having cut out portions in theportion in said pocket to permit flexing of said rubber inwardly of saidpocket during braking.

'7. In a brake, an anchor pin, an annular one piece brake band havingone end thereof movable toward and away from contact with said anchorpin, and means constituted solely by a single resilient memberinterposed between said anchor pin and said brake shoe end, saidresilient member having a portion thereof contoured complementary toonly a part of the circumference of said anchor pin to directly engageonly the corresponding portion of said anchor pin for retarding movementof said brake shoe end toward said anchor pin upon applying the brake.

GERHARD o. R. KUIPER,

